If you try to launch it, python will either complain about a missing avbin-library OR (in case you *do* have multimedia/avbin installed) there's an error message about some "undefined img_convert symbol". But none of this is important, because this port is badly outdated. Version 4.4 is from 2009. The current version is 4.8.4 (from 2015).
(In reply to Peter Kien from comment #0) Can you submit a patch that updates it?
A commit references this bug: Author: amdmi3 Date: Thu Dec 12 19:59:18 UTC 2019 New revision: 519945 URL: https://svnweb.freebsd.org/changeset/ports/519945 Log: - Update to 5.0.git20191222 PR: 219955 Changes: head/games/brainworkshop/Makefile head/games/brainworkshop/distinfo head/games/brainworkshop/files/patch-brainworkshop.pyw head/games/brainworkshop/pkg-descr